Patent GB-135242-A (GB)
IPC: G01G1/00
Abstract: 135,242. White, A. E., (Toledo Scale Co.). Oct. 17, 1918. Indicating-mechamism.-Relates to a weighing- scale having two or more pointers for indicating net, gross, and tare weights as described in Specification 110,257, in which one or more of the pointers are adjustable relatively to the other pointer or pointers. Mechanism under the control of the operator is provided for locking one of the pointers while permitting of the movement of the other, and for automatically moving or zeroizing the free pointer when the other pointer is locked. The indicating-spindle 22, Figs. 1 and 6, is actuated by any suitable weighing-mechanism, such as the rolling-segment mechanism 9, 16, and carries at its front end a fixed pointer 27, the hub 33 of the adjustable pointer 34 being detachably connected to the spindle 22 by a friction clutch and having a flange 32 normally contacting with a flange 30 on the hub 26 of the pointer 27. A spider 40 has studs 39 engaging apertures in a disk 38 which is forced against a cupped friction disk 37 on the hub 33 by springs 41. When a lever 43 is tripped by a cam 46, its bifurcated upper arm 42 disengages the disk 38 from the disk 37 and holds the spindle 22 and a pointer 27 fixed. For rotating the pointer 34 while the pointer 27 is locked, a heart-shaped cam 36 on the hub 33 is engaged by a roller 49 carried by a lever 50 operated through a rod 52 and a bell-crank lever 57 from a cam 59. The pointer 34 points to zero when the roller 49 is in engagement with the centre part of the recess of the cam 36. The cam 58 is loose on the shaft 59 and has a slot 65 with which a pin 64 on the cam engages. On placing the container on the platform, the pointers 27, 34 move together: the pointer 27 is then locked in position to show the tare, and the other pointer 34 is returned to zero. On releasing the handle 61, a coiled spring 63 returns the shaft 59 and cams 46, 58 to normal position. The material to be weighed is then placed in the container, and the net and gross weights are shown by the pointers 34, 27 respectively. The weighing of articles can be continued without removing the articles already on the platform, the pointer 34 giving the weight of the article last placed on the platform, and the pointer 27 giving the total weight on the platform. To allow a number of containers of the same weight, or the same containers with different weights of goods, to be used repeatedly, means is provided for setting the pointer 34 to indicate the tare without actually placing the container on the platform. The steelyard rod 20 is forced downwardly a sufficient distance to actuate the mechanism to move the pointers to indicate the tare by the engagement above its turn-buckle 20a of one arm of a lever 67 operated by a threaded shaft 68. On releasing the handle 70 of the shaft 68, a coiled spring 71 returns the lever 67 to its original position, while the pointer 34 is rotated back to zero, a distance equivalent to the tare. In a modification, Fig. 10, means are provided for electrically actuating the clutch-operating lever 42a and the rod 52<a> of the roller 49. The cores of two solenoids 80, 81 are respectively connected to the rod 52a and a lever 45<a> fixed to the lever 42a, and a pivoted switch arm 93 makes and breaks the circuit through the solenoid 81, while a supplemental arm 99 operated by the arm 93 makes and breaks the circuit through the solenoid 80.